Three Sisters Peaks
Summit in San Bernardino County, California · on the USGS Onyx Peak quadrangle
34.14463, -116.64920
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Onyx Peak, CA
USGS topo, 2021
Morongo Valley, CA
USGS historical 15-minute topo (1955)
IFR Enroute Low Altitude Chart L-07 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-04 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-04 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-03 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).